热压烧结Gr/6061Al复合材料的组织与性能  

Microstructure and Properties of Gr/6061Al Composites Sintered by Hot Pressing

作　　者：鲁宁宁[1] 许磊[1] 历长云[1] 王有超[1] 米国发[1] 杨二阔 Lu Ningning;Xu Lei;Li Changyun;Wang Youchao;Mi Guofa;Yang Erkuo(Henan Polytechnic University, Jiaozuo 454000,China)

机构地区：[1]河南理工大学

出　　处：《稀有金属材料与工程》2019年第6期1961-1968,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51401077)

摘　　要：采用热压烧结法制备了片层石墨(Gr)含量为1%~25%(体积分数,下同)的Gr/6061Al复合材料,并采用纳米铝粉包覆片层石墨的混粉工艺提高片层石墨在铝基体粉末中的分散均匀性。所制备的复合材料中,片层石墨均匀分散在铝基体中,界面结合良好,未发现界面反应产物,通过透射电镜观察到少层石墨烯的存在。1%~15%Gr含量的Gr/6061Al复合材料的致密度均高于90%;复合材料的致密度,硬度和摩擦系数随着片层石墨含量的增加都逐渐降低;随着烧结温度的提高,10%Gr含量的Gr/6061Al复合材料的致密度和硬度均得到提高。与1%和25%Gr含量的Gr/6061Al复合材料相比,其他Gr含量的复合材料的磨损率均较高。The graphite sheet(Gr)/6061 Al composites with Gr content of 1%~25%(volume fraction) were prepared by vacuum hot-pressure sintering. The nano-aluminum powders were adopted as cladding materials on the surface of graphite sheet to improve the dispersal uniformity of graphite sheet within aluminum matrix. The graphite sheet disperses uniformly in the aluminum matrix, and the interface between aluminum and Gr is well without interfacial reaction product being found. Few layer grapheme is observed by transmission electron microscopy(TEM). The relative densities of the Gr/6061 Al composites with 1%~15% Gr content are all higher than 90%. The relative density, hardness and coefficient of friction(COF) of the samples decrease with the increasing of graphite content. However,, with the increasing of the sintering temperature, the relative density and hardness of the Gr/661 Al composite with 10% Gr increase. The wear rate of the samples with Gr content of 5%, 10% and 15% are all higher than that with 1% and 25% Gr.

关 键 词：片层石墨 铝基复合材料 致密度 磨损率 摩擦系数 

分 类 号：TB333[一般工业技术—材料科学与工程]